<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <button v-on:click="sayHi">点我！</button>
</div>


<script src="https://cdn.jsdelivr.net/npm/vue@2.5.21/dist/vue.js "></script>

<script>
    var vm=new Vue({
        el:"#app",
        data: {
            message: "Cherish学前端"
        },
        methods: {//方法必须定义在vue的method对象中
            sayHi: function (event) {
                alert(this.message)
            }
        }
    });
</script>

</body>
</html>